SAN - sinoatrial node, where is the SAN located? - located within the walls of the right atrium , AVN - atrioventricular node, where is the AVN located? - located in the centre of the heart , what acts as a buffer/ gate? - AVN slows down the signal from the SAN, Bundle of his  - specialist heart muscle cells , Purkinje fibres - filaments which allow the ventricle to contract at regular intervals., SAN function - contract forcing forces blood within the atria down into the ventricles., Purkinje fibres function - cause blood to be pushed out of the heart either to the lungs or to the working muscles., what are the purkinje fibres attached to? - bundle of his ,

Neural control of the cardiac cycle

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